export default {
	namespaced:true,
	
	state:()=>({
		//购物车的数组，用来存储购物车中每个商品的信息对象
		//每个商品的信息对象，都包含如下6个属性：
		//{goods_id,goods_name,goods_price,goods_count,goods_small_logo,goods_state}
		cart: JSON.parse(uni.getStorageSync('cart')||'[]')
	}),
	
	mutations:{
		addToCart(state,goods){
			const findResult=state.cart.find(x => x.goods_id === goods.goods_id)
			if(!findResult){
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			
			
			this.commit('m_cart/saveToStorage')
	},
	saveToStorage(state){
		uni.setStorageSync('cart',JSON.stringify(state.cart))
		},
	updateGoodsState(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			
			if(findResult) {
				findResult.goods_state = goods.goods_state
				
				this.commit('m_cart/saveToStorage')
			}
		},
		updateGoodsCount(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			
			if(findResult) {
				findResult.goods_count = goods.goods_count
				
				this.commit('m_cart/saveToStorage')
			}
		},
		//根据Id删除对应的商品
		removeGoodsById(state, goods_id){
			state.cart=state.cart.filter(x => x.goods_id !== goods_id)
			
			this.commit('m_cart/saveToStorage')
		},
		//更新购物车中所有商品的勾选状态
		updateAllGoodsState(state, newState){
			state.cart.forEach(x => x.goods_state = newState)
		}
	},
	// 更新购物车中的商品勾选状态
	
	getters:{
		 total(state){
		// 	let c = 0
		// 	state.cart.forEach(x => c +=x.goods_count)
		// 	return c
		return state.cart.reduce((total,item) => total += item.goods_count, 0)
		 },
		
		checkedCount(state) {
			return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
		},
		checkedGoodsAmount(state) {
			return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count * item.goods_price, 0).toFixed(2)
		}
	}
}